North Sea

IHO sea area 4 · -4° to 12° E, 51° to 61° N

in force
3
last 12 months
3
since 1997
4,727
categories
11

In force now · 3

  1. HYDROLANT 1496/26 · Surveys2026-08-03
    Survey operations are underway in the North Sea near Norway by the vessel Ramform Hyperion towing ten 2740-meter cables, requesting a three-mile berth.
  2. HYDROLANT 1488/26 · Nav aids2026-08-01
    Medium frequency DSC and radiotelephone services are off air at Bawdsey, Cullercoats, and Gregness site. Hydrolant 1441/26 is cancelled.
  3. HYDROLANT 1477/26 · Surveys2026-07-31
    Survey operations are in progress in the North Sea off Norway, with vessel Amazon Conqueror towing eight 1609-meter cables; two-mile berth requested.

Longest in force

  1. HYDROLANT 1477/26 · Surveys2026-07-31
    Survey operations are in progress in the North Sea off Norway, with vessel Amazon Conqueror towing eight 1609-meter cables; two-mile berth requested.
  2. HYDROLANT 1488/26 · Nav aids2026-08-01
    Medium frequency DSC and radiotelephone services are off air at Bawdsey, Cullercoats, and Gregness site. Hydrolant 1441/26 is cancelled.
  3. HYDROLANT 1496/26 · Surveys2026-08-03
    Survey operations are underway in the North Sea near Norway by the vessel Ramform Hyperion towing ten 2740-meter cables, requesting a three-mile berth.

By year

97
98
99
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
26

By month (all years)

J
F
M
A
M
J
J
A
S
O
N
D

By category · since 1997

Nav aids2,50053%
Other66814%
Cable ops65814%
Surveys58212%
Wrecks1704%
Containers441%
Derelicts341%
Exercises321%
Debris291%
Mines90%
Missiles10%

Archive · 4,724 cancelled

  1. HYDROLANT 288/20 · Nav aids2020-01-27 → 2020-01-28
    Europa 49/22 platform 53-14.9N 002-17.8E unlit
  2. HYDROLANT 213/20 · Nav aids2020-01-22 → 2020-01-24
    RACON at duncansby head light 58-38-38N 003-01-30W inoperative
  3. HYDROLANT 212/20 · Other2020-01-22 → 2020-08-28
    Unexploded ordnance in 52-22.63N 002-49.27E
  4. HYDROLANT 201/20 · Cable ops2020-01-21 → 2020-01-22
    Cable operations in progress until further notice by cableship sovereign in vicinity 52-35.8N 002-15.6E
  5. HYDROLANT 200/20 · Nav aids2020-01-21 → 2020-01-24
    Ruytingen northwest buoy 51-09.1N 001-57.3E unlit
  6. HYDROLANT 193/20 · Nav aids2020-01-20 → 2020-03-03
    Cgoc humber mf dsc and r/t services at langham site 52-56.5N 000-57.2E off air
  7. HYDROLANT 175/20 · Cable ops2020-01-17 → 2020-01-21
    Cable operations in progress until further notice by cableship sovereign in vicinity 53-00.2N 002-23.9E
  8. HYDROLANT 55/20 · Cable ops2020-01-07 → 2020-01-13
    Cable operations in progress until further notice by cableship sovereign in vicinity 52-21.2N 002-51.3E
  9. HYDROLANT 53/20 · Nav aids2020-01-07 → 2020-01-22
    All navigational aids at wenlock platform, 53-35.3N 002-17.7E inoperative
  10. HYDROLANT 4013/19 · Nav aids2019-12-30 → 2020-01-03
    Hoy sound rear light 58-56.1N 003-16.3W unreliable
  11. HYDROLANT 3778/19 · Nav aids2019-12-09 → 2019-12-09
    Sumburgh head light 59-51.2N 001-16.5W unreliable
  12. HYDROLANT 3767/19 · Nav aids2019-12-09 → 2020-01-20
    Cgoc humber mf dsc and r/t services at langham site 52-56.5N 000-57.2E off air
  13. HYDROLANT 3694/19 · Nav aids2019-12-02 → 2019-12-03
    Cgoc aberdeen mf dsc services at greg ness site 57-07.6N 002-03.2W off air
  14. HYDROLANT 3670/19 · Nav aids2019-11-29 → 2019-12-11
    Anglia gas platform 53-22.1N 001-39.2E unlit and all aids to navigation inoperative
  15. HYDROLANT 3658/19 · Nav aids2019-11-28 → 2019-11-29
    Kinnairds head light 57-41.9N 002-00.2W unreliable
  16. HYDROLANT 3656/19 · Nav aids2019-11-28 → 2019-12-02
    Cgoc aberdeen mf dsc services at greg ness site 57-07.6N 002-03.2W unreliable
  17. HYDROLANT 3606/19 · Nav aids2019-11-25 → 2019-11-26
    Cgoc aberdeen mf dsc services at greg ness site 57-07.6N 002-03.2W off air
  18. HYDROLANT 3602/19 · Nav aids2019-11-24 → 2020-01-01
    All navigational aids at shamrock platform, 53-28.2N 002-55.3E unreliable
  19. HYDROLANT 3561/19 · Nav aids2019-11-21 → 2019-11-22
    Cgoc aberdeen mf dsc services at greg ness site 57-07.6N 002-03.2W off air
  20. HYDROLANT 3536/19 · Nav aids2019-11-18 → 2019-11-29
    Foxtrot 3 lightship 51-23.8N 002-00.6E unreliable

Sea boundaries: Flanders Marine Institute (2018), IHO Sea Areas v3, marineregions.org (CC BY 4.0). Not for navigation — follow official NAVAREA / coastal broadcasts.